Page "Cylinder lock" Paragraph 3

Standardised types of cylinder include key-in-knobset cylinders, rim ( also known as nightlatch ) cylinders, Ingersoll format cylinders, American, and Scandinavian round mortise cylinders, and Scandinavian oval cylinders.

There are also standardised cross-sectional profiles for lock cylinders that may vary in length-for example to suit different door thicknesses.

These profiles include the europrofile ( or DIN standard ), the British oval profile and the Swiss profile.